Is a healing charm with 40% EE the same as a healing charm of the same level and type with 40% heal mastery?

The only true way to find out is to test.
Unless someone else has already tested, no one knows.

PM me if you have any further questions.

true

Basics say yes...

Heal Mastery = 40% enhanced effect to heal effect
Enhanced Effect = 40% heal effect

well, also consider that most ppl that use a heal charm place it in the accessory slot. A charm with 40% HM in the accessorty slot will effectively be that of a white. As for which is better, the results are going to vary depending how much int you have (hm effects are scaled with int) etc.

I can say that I would rather have a 70%HM charm over a 70%ee Heal. GL on your testing

no since your int affects both in different ways

The most important thing to take note of is that HM doesn't work in the Acc slot, only ee does. (as mentioned by Stok3d)
That eliminates almost all usefulness of a plain HM charm outside of catacomb games.

I used to own a 127ee, 24hm heal and it healed better than a 170ee heal. Perhaps that's some insight into Heal mastery for you.
In most cases HM is approximately 2x the healing effectiveness of EE or INT. I know that logic offends the people who want to crunch the exact formulas//numbers for this game, but it's good enough if you don't mind being off a percent here or there depending on a few other factors.

This post was edited by mwm_zyxcba on Mar 8 2010 08:25pm